LG P7200 - Page 89

4. TROUBLE SHOOTING
- 90 -
2012 1/4W
1608
EL OFF
EL DRIVER IC
HIGH EL ON
LOW
C750
33
R750
2200p
820uH
L700
D381BU700
1
CHF
CLF
2
E
3
GND
4
7
L+
5
L-
V+
8
6
VOUT
C703
1u
KDZ100VW
ZD700
VBAT
C731
NA
68KR701
6800p
C705
68p
C704
EL_OUTKEY_BACKLIGHT
START
EL sheet is teared?
NO
YES
EL sheet will work properly.
R701 is well-soldered?
YES
Replace EL sheet
NO
YES
Voltage of R701 is high?
Resolder R701
NO
Replace U103
Replace U700
CIRCUIT DIAGRAM
Checking Flow